![What were these memory slots used for? Obviously memory stick duo was for psp, but what about the SD and CF ones? I didn't even know what CF was until now : What were these memory slots used for? Obviously memory stick duo was for psp, but what about the SD and CF ones? I didn't even know what CF was until now :](https://preview.redd.it/what-were-these-memory-slots-used-for-obviously-memory-v0-davm81rvadva1.jpg?auto=webp&s=6ddfb176cf0c407c77d0c552516696eeb2742769)
What were these memory slots used for? Obviously memory stick duo was for psp, but what about the SD and CF ones? I didn't even know what CF was until now :
![Sony PlayStation 3 Console PS3 Slim Bundle Cords + Memory Card Works - electronics - by owner - sale - craigslist Sony PlayStation 3 Console PS3 Slim Bundle Cords + Memory Card Works - electronics - by owner - sale - craigslist](https://images.craigslist.org/00202_kOMpDCVYNc7_0t20CI_600x450.jpg)
Sony PlayStation 3 Console PS3 Slim Bundle Cords + Memory Card Works - electronics - by owner - sale - craigslist
![Amazon.com: Replacment Black White Full Housing Shell Case Cover for PS3 Playstatoin3 Slim 120G 320G Console Full Housing with Screws and Pads Buttons Set (Black Housing Kit) : Video Games Amazon.com: Replacment Black White Full Housing Shell Case Cover for PS3 Playstatoin3 Slim 120G 320G Console Full Housing with Screws and Pads Buttons Set (Black Housing Kit) : Video Games](https://m.media-amazon.com/images/I/41mRW2eRw-L._AC_UF894,1000_QL80_.jpg)